Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Que instituição se juntou em 1988?
 ###Tabelas: CREATE TABLE season_1:_2001 (season_1:_2001_id AUTO_INCREMENT PRIMARY KEY, Series Ep. VARCHAR, Episode INT, Netflix VARCHAR, Segment A VARCHAR, Segment B VARCHAR, Segment C VARCHAR, Segment D VARCHAR) CREATE TABLE current_members (current_members_id AUTO_INCREMENT PRIMARY KEY, Institution VARCHAR, Location VARCHAR, Nickname VARCHAR, Founded INT, Type VARCHAR, Enrollment INT, Joined INT) CREATE TABLE overview_by_city (overview_by_city_id AUTO_INCREMENT PRIMARY KEY, Metropolitan Area VARCHAR, Media Market Ranking INT, Hosted 4 teams since INT, NFL Team(s) VARCHAR, MLB Team(s) VARCHAR, NBA Team(s) VARCHAR, NHL Team(s) VARCHAR) CREATE TABLE current_medical_schools_in_the_caribbean (current_medical_schools_in_the_caribbean_id AUTO_INCREMENT PRIMARY KEY, Country/Territory VARCHAR, Established INT, Degree VARCHAR, Regional/Offshore VARCHAR, IMED/Avicenna Listed VARCHAR) CREATE TABLE complete_results (complete_results_id AUTO_INCREMENT PRIMARY KEY, Position INT, Name VARCHAR, Country VARCHAR, Win-Loss VARCHAR, Spread INT)  
SELECT Institution FROM current_members WHERE Joined = 1988